[普化試題] 92年交大 應化系 化學二期末
1 ( 20% ) Consider the following for the formation of a DNA double
helix from its strands A and B:
A + B → unstable helix ( fast ,k1 and k1' )
←
Unstable helix → stable doubl helix (slow,k2)
Derive the rate equation for the formation of the stable double
helix and express the rate constant of the overall reaction in terms of the
rate constants of the individual steps.
2 ( 7% ) The rate constant of the reaction O(g) + N2(g) → NO(g) +N(g),
which occurs in the stratosphere, is 9.7 * 10^10 L mol^(-1)s^(-1) at 800 度c
. the activation energy of the reaction is 315 kJ mol^(-1). Determine the rate
constant at 700 度c
3 ( 8 % ) Determine the rate constants for the following first-order reactions:
(a) A→B,given that the concentration of A decreases to one-half its initial
value in 1000s.
(b) 2A→B+C,given that [A]0=0.153 molL^(-1) and that after 115 s the concentra-
tion of B rises to 0.034 mol L^(-1)
4. ( 18 % ) A. Write the shortened ( condensed ) structural formula of
(a) ethylbenzene
(b) 2,3,5,-trimethylheptane
(c) 2-ethyl-1,1,-dimethylcyclohexane
B.Indicate which molecules display optical activity and indicate the chiral ca
rbon atoms in those that do
(d) CH3CHBrCH2Ch3
(e) CH3CH2CHCl2
(f) CH3CH(OH)CH2CH3
5.( 7% ) What are the possible products for the reaction of sodium ethoxide
(NaOCH2CH3) with
(a) 1-bromobutane
(b) 2-bromobutane
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